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Northwest Africa 10058
Basic information Name: Northwest Africa 10058
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10058
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 79.1 g
Meteoritical Bulletin:  MB 104  (2015)  H3
Recommended:  H3    [explanation]

This is 1 of 620 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 12 Nov 2015
Writeup from MB 104:

Northwest Africa 10058 (NWA 10058)


Purchased: 2014

Classification: Ordinary chondrite (H3)

Petrography: The average kamacite Co content is 0.52 wt.%, consistent with H. Chondrules average about 300 μm in diameter, consistent with H. The Cr2O3 content of ferroan olivine grains (n=18) is 0.06±0.08 The rock contains a dark-colored clast, which is poorer in coarse metal and sulfide than the chondritic host. There are curvilinear trails of metal and sulfide dispersed through the clast, indicating shock darkening. Many of the low-Ca pyroxene grains exhibit polysynthetic twinning. Chondrules do not contain clear, isotropic glass.

Geochemistry: Olivine Fa12.9±7.6 (n=20) and pyroxene Fs8.3±6.3Wo0.7±0.5 (n=18)

Classification: The sharply defined chondrules, presence of recrystallized silicate matrix material, and absence of Coarse chromite and plagioclase grains indicate that it is petrologic type 3. The olivines are compositionally more heterogeneous than those in H3.8 Dhajala, indicating that the petrologic type is <3.8. The absence of clear, transparent isotropic glassy mesostasis in the chondrules is characteristic of subtype 3.6-3.9. Most of the low-Ca pyroxene phenocrysts in chondrules exhibit polysynthetic twinning, indicative of subtype =<4. According to Table 1 of Huss et al. (2006), this is consistent with subtype =<3.4. Low-Ca pyroxene is also heterogeneous with a PMD of 62.9%, consistent with subtype =<3.6. The Cr2O3 data in ferroan olivine is indicative of subtype =>3.2. The analytical data suggest subtype 3.4 or so, but from the absence of clear isotropic mesostasis, the higher range is a better classification as H3.6.

  • Huss, G.R., Rubin, A.E. and Grossman, J.N. (2006) Thermal Metamorphism in Chondrites. in Meteorites and the Early Solar System II, D.S. Lauretta and H.Y. McSween Jr. (eds.), University of Arizona Press, Tucson, 943 pp., 567-586. (link)
Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014
Mass (g):79.13
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):12.9±7.6 (n=20)
Ferrosilite (mol%):8.3±6.3
Wollastonite (mol%):0.7±0.5 (n=18)
Classifier:A. Rubin, J. Breen, UCLA
Type spec mass (g):31.46
Type spec location:UCLA
Main mass:Sean Tutorow
Comments:G593;; submitted by S. Tutorow
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 1505 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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